fix(ci): update .main.commit for non-dev mcore branches

[ko3n1g]

Summary

• When bumping on release branches (e.g. r0.4.0 with mcore-branch=mcore-core_r0.17.0), the mcore-branch input matches neither "main" nor "dev", so .main.commit was never written
• The unit test test_main_commit_matches_submodule then fails because the bumped submodule commit no longer matches .main.commit
• Fix: write .main.commit for all non-dev branches (covers both main and release branches)

Before:

if [[ "$TARGET_BRANCH" == "main" ]]; then
    echo $MLM_COMMIT > .main.commit
elif [[ "$TARGET_BRANCH" == "dev" ]]; then
    echo $MLM_COMMIT > .dev.commit
fi

After:

if [[ "$TARGET_BRANCH" == "dev" ]]; then
    echo $MLM_COMMIT > .dev.commit
else
    echo $MLM_COMMIT > .main.commit
fi

Test plan

• Verify test_main_commit_matches_submodule passes on next bump run for r0.4.0

Summary by CodeRabbit

Release Notes

• Chores
  • Updated internal dependency management workflow to improve commit tracking across different release branches.

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Note: This release contains only internal infrastructure improvements with no direct impact on end-user functionality.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: dc237712-01d4-4afc-a4cc-f12ba9ce38f2

📥 Commits

Reviewing files that changed from the base of the PR and between 07c9920 and c52778e.

📒 Files selected for processing (1)

• .github/workflows/_update_dependencies.yml

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📝 Walkthrough

Walkthrough

The workflow file's conditional logic for writing Megatron-LM submodule commit hashes has been restructured. The logic now checks if TARGET_BRANCH is dev to write to .dev.commit, and otherwise writes to .main.commit. The previous implementation had separate conditions for main and dev branches.

Changes

Cohort / File(s)	Summary
Workflow Branch Targeting .github/workflows/_update_dependencies.yml	Modified conditional logic for submodule commit hash file writing based on TARGET_BRANCH value; changed from separate if/elif conditions to a consolidated check for dev branch with a default case.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: updating .main.commit to be written for non-dev branches (mcore branches) instead of only for main.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Test Results For Major Changes	✅ Passed	Minor CI workflow bug fix with documented test plan verifying test_main_commit_matches_submodule passes on next bump run.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ko3n1g/fix/update-main-commit-release-branches

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